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Water Quality Characteristics Evaluation by Flow Conditions Using Load Duration Curve - in Youngbon A Watershed -

박진환 1,  Kapsoon Kim 1,  정재운 1,  황경섭 1,  문명진 1,  함상인 1,  임병진 2

1국립환경과학원
2국립환경연구원

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ABSTRACT

This study was conducted to identify runoff characteristics of pollutants using flow duration curve(FDC) and load duration curve(LDC) in Youngbon A watershed during 2009~2011. A flow rate and pollutant load in the study watershed were estimated by equation of stage-discharge and discharge-loads rating curve. From these methods, BOD, T-N, and T-P have evaluated whether water quality standards would have attained. Results showed that BOD loads of about 50% plotted above the LDC, while T-N and T-P loads of about 50% plotted below the curve. It means that BOD of about 50% have exceeded the water quality criteria, while T-N and T-P of about 50% have complied with the water quality standards. Meanwhile, BOD, TN and T-P loads plotted above the LDC of low flows, implying that they were more affected by point pollution sources than nonpoint pollution sources in the study watershed.

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